Quad rendering bug

[HarryTuttle]

Harry,
can you find any bad quads that are the first ones in the list? (Ie no shared verts). If they are, then the gpu is deciding to split them somehow. If not perhaps they are just related to how they are coming out of memory ..
Lost world doesn't use any shared vertices, so every quad would be a first quad :p

You mean some visual reference?

[Ian]

Yeah exactly

[HarryTuttle]

Ian, I think I found one after all, i marked every quad with no shared vertex and specular enabled (with the latter set it's easier to find something wrong):

Left: Supermodel, Mid: Supermodel with poly marked as magenta, Right: Abe's video

ral_01.jpeg (239.48 KiB) Viewed 7486 times

[Ian]

Nice
Does it look normal if you switch the split direction?
Will definitely have a look at this one

[HarryTuttle]

I've to try. Will post the result soon...

[Ian]

Okay thanks
Also the specular looks pretty nice

[HarryTuttle]

Yeah, it works!

Left: Supermodel, Mid: Supermodel with poly marked as magenta, Right: Abe's video

ral_02.jpeg (239.16 KiB) Viewed 7483 times

[Ian]

So if that quad isn't sharing any vertices.. How is the hw deciding which way to split the poly ..

[HarryTuttle]

Could it be that are just drawn like this? So the following polys in the strip with shared vertices change the split direction accordingly?

[Ian]

Possibly yes
Wonder if you can find any quads that aren't sharing vertices that already look correct, and look incorrect when you change the split? That would be interesting to know...